\begin{tikzpicture}
	\pgfmathsetmacro{\r}{2.5}
	\pgfmathsetmacro{\R}{3.5}
	\pgfmathsetmacro{\a}{30}
	\pgfmathsetmacro{\b}{45}

	\begin{scope} [xshift=-1cm]
		\tkzDefPoints{0/0/B, \r/0/A}
		\tkzDefPoint(\a:\r){C}
		\tkzDrawSegments(B,A  B,C)
		\tkzMarkAngle[size=0.5](A,B,C)
		\tkzLabelAngle[pos=0.8](A,B,C){$1$}
	\end{scope}

	\begin{scope} [xshift=2cm]
		\tkzDefPoints{0/0/B, \r/0/A}
		\tkzDefPoint(\b:\r){C}
		\tkzDrawSegments(B,A  B,C)
		\tkzMarkAngle[arc=ll, size=0.5](A,B,C)
		\tkzLabelAngle[pos=0.8](A,B,C){$2$}
	\end{scope}

	\begin{scope} [yshift=-4cm]
		\tkzDefPoints{0/0/B, \R/0/A}
		\tkzDefPoint(\a:\R){C}
		\tkzDefPoint(\a+\b:\R){D}
		\tkzDrawSegments(B,A  B,C B,D)
		\tkzMarkAngle[size=0.5](A,B,C)
		\tkzMarkAngle[arc=ll, size=0.8](C,B,D)
		\tkzLabelPoints[below](B, A)
		\tkzLabelPoints[right](C, D)
	\end{scope}
\end{tikzpicture}

